Curves: Port mesh to curve node to new data-block

The main improvement is a code simplification, because attributes don't
have to be transferred separately for each curve, and all attributes can
be handled generically. Performance improves significantly when the
output contains many curves. Basic testing with a 2 million curve output
shows an approximate 10x performance improvement.

2 files changed, 3 insertions, 6 deletions

diff --git a/source/blender/nodes/geometry/nodes/legacy/node_geo_legacy_mesh_to_curve.cc b/source/blender/nodes/geometry/nodes/legacy/node_geo_legacy_mesh_to_curve.cc
index 8991261a21a..72cb540df4a 100644
--- a/source/blender/nodes/geometry/nodes/legacy/node_geo_legacy_mesh_to_curve.cc
+++ b/source/blender/nodes/geometry/nodes/legacy/node_geo_legacy_mesh_to_curve.cc
@@ -45,10 +45,8 @@ static void node_geo_exec(GeoNodeExecParams params)
     return;
   }
 
-  std::unique_ptr<CurveEval> curve = geometry::mesh_to_curve_convert(
-      component, IndexMask(selected_edge_indices));
-
-  params.set_output("Curve", GeometrySet::create_with_curves(curve_eval_to_curves(*curve)));
+  Curves *curves = geometry::mesh_to_curve_convert(component, IndexMask(selected_edge_indices));
+  params.set_output("Curve", GeometrySet::create_with_curves(curves));
 }
 
 }  // namespace blender::nodes::node_geo_legacy_mesh_to_curve_cc
diff --git a/source/blender/nodes/geometry/nodes/node_geo_mesh_to_curve.cc b/source/blender/nodes/geometry/nodes/node_geo_mesh_to_curve.cc
index d2b824141d7..f6ee3d00dee 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_mesh_to_curve.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_mesh_to_curve.cc
@@ -34,8 +34,7 @@ static void node_geo_exec(GeoNodeExecParams params)
       return;
     }
 
-    std::unique_ptr<CurveEval> curve = geometry::mesh_to_curve_convert(component, selection);
-    geometry_set.replace_curves(curve_eval_to_curves(*curve));
+    geometry_set.replace_curves(geometry::mesh_to_curve_convert(component, selection));
     geometry_set.keep_only({GEO_COMPONENT_TYPE_CURVE, GEO_COMPONENT_TYPE_INSTANCES});
   });